The Crypta Balbi is a city-block of the historic centre of Rome wherein a vast portico, the Crypt of Balbus, rose in ancient times; it was an annexe of the theatre that Cornelius Balbus had erected in 13 BCE.

The Baths of Diocletian (Terme di Diocleziano) are the most imposing thermal complex ever built in Rome. Erected between 298 and 306 CE, they spanned more than 13 hectares and could accommodate up to 3000 people at the same time,...